PPU_CTRL	=$2000
PPU_MASK	=$2001
PPU_STATUS	=$2002
PPU_OAM_ADDR	=$2003
PPU_OAM_DATA	=$2004
PPU_SCROLL	=$2005
PPU_ADDR	=$2006
PPU_DATA	=$2007
PPU_OAM_DMA	=$4014
PPU_FRAMECNT	=$4017
DMC_FREQ	=$4010
CTRL_PORT1	=$4016
CTRL_PORT2	=$4017

OAM_BUF		=$0200
PAL_BUF		=$01c0
